Definition: You are given a question on college medicine. You are also given 4 answer options (associated with "A", "B", "C", "D"), out of which only one is correct. You need to answer the question by selecting the correct option. You should only answer with the choice letter, not the whole answer.
Input: The net production of ATP via substrate-level phosphorylation in glycolysis is:
(A)2 from glucose and 3 from glycogen. (B)2 from glucose and 4 from glycogen. (C)3 from glucose and 4 from glycogen. (D)3 from glucose and 2 from glycogen.

A